Steam turbine governing valve redundancy control system and control method thereof

Abstract

The invention discloses a steam turbine governing valve redundancy control system and a control method thereof. Redundant distributed control units and redundant valve positioner modules are combined to control steam turbine governing valves. The distributed control units are arranged in pairs, the current valve position instruction signals of the steam turbine governing valves are calculated in real time to be sent to the valve positioner modules. The valve positioner modules are arranged in pairs, feedback signals of two different steam turbine governing valves are collected at the same time, the valve position instruction signals sent by the distributed control units are combined with the feedback signals, the instruction signals of a current governing valve servo valve are calculated and output to drive two coils of hydraulic servo-motor servo valves corresponding to the two governing valves, closed loop control over the steam turbine governing valves is achieved, the two coils of the hydraulic servo-motor servo valves corresponding to each steam turbine governing valve are respectively controlled by adopting the two valve positioner modules which are arranged in pairs, safety of valve control of a steam turbine is improved greatly, and on-line non-stop and interference-free renewing of the valve positioner modules can be achieved.

Description

[0001] technical field [0002] The invention relates to the technical field of electromechanical equipment control, in particular to a redundant control method for steam turbine adjustment valves. Background technique [0003] The steam turbine is an important prime mover equipment that is widely used. Since the steam turbine is a high-speed rotary equipment that uses high-temperature and high-pressure working fluid, the control method to ensure its safe and stable operation is of great significance. The important controlled parameters of steam turbine operation: steam turbine speed, steam turbine head pressure and steam turbine output power are all realized by controlling the opening of the steam turbine valve, so the steam turbine valve control method and system are the core of the steam turbine regulation and protection system. [0004] For large steam turbines with high control stability and precision requirements, distributed control systems are used at home and abroad...

AI Technical Summary

Problems solved by technology

[0004] For large steam turbines with high control stability and precision requirements, distributed control systems are used at home and abroad at present. The power supply and distributed control units of the distributed control system have realized the redundant configuration of two-way mutual backup. Redundancy is not realized, and each valve is controlled by one and only one valve positioner module, which has potential safety hazards. Once the valve positioner module fails, the corresponding steam turbine valve may be out of control, and the valve positioner module cannot Realize online non-stop and non-disruptive replacement, but only stop the replacement

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